You look like a handsome guy, maybe even better whitout hair. Some girls are really superficial, but it could well be a reaction to your insecurity. Not to you being bald. I started balding a year ago (diffuse all over the top). Two weeks ago i got a shave and i am still not comfortable wth the prospect of a bald head the rest of my life. But before i noticed me going bald, ik never thought of it as a real issue. I even bullied soms of my balding buddies. Not realising that it might be an issue for them. So as for your friends, they don't mean real harm. Some of them are probably getting the same carma for joking i have gotten ;-)